package com.hmdp.utils;

import cn.hutool.core.bean.BeanUtil;
import cn.hutool.core.util.StrUtil;
import com.hmdp.dto.UserDTO;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.web.servlet.HandlerInterceptor;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.util.Map;
import java.util.concurrent.TimeUnit;

import static com.hmdp.utils.RedisConstants.LOGIN_USER_KEY;
import static com.hmdp.utils.RedisConstants.LOGIN_USER_TTL;

/**
 * hm-dianping
 * com.hmdp.utils
 * zjj19
 * 2024/5/30
 * 23:58
 * 2024 05 38
 */


public class RefreshTokenInterceptor implements HandlerInterceptor {

    private StringRedisTemplate stringRedisTemplate;

    public RefreshTokenInterceptor(StringRedisTemplate stringRedisTemplate) {
        this.stringRedisTemplate = stringRedisTemplate;
    }

    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        // 在请求处理之前执行的代码
        //1.获取token
        String token = request.getHeader("authorization");
        if (StrUtil.isBlank(token)) {
            return true;
        }

        //2.获取redis中的用户
        Map<Object, Object> userMap = stringRedisTemplate.opsForHash().entries(LOGIN_USER_KEY + token);

        //3.判断用户是否存在
        if (userMap.isEmpty()) {
            return true;
        }


        //5.将hash数据转为UserDTO对象
        UserDTO userDTO = BeanUtil.fillBeanWithMap(userMap, new UserDTO(), false);

        //6.存在，保存用户信息到ThreadLocal
        UserHolder.saveUser(userDTO);
        //7.刷新token的有效期
        stringRedisTemplate.expire(LOGIN_USER_KEY + token, LOGIN_USER_TTL, TimeUnit.MINUTES);
        //8.放行
        return true; // 如果返回 false，则请求将被拦截，不会继续执行后续操作
    }


    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
        // 在整个请求处理完成之后执行的代码，包括视图渲染
        //移除用户
        UserHolder.removeUser();
    }
}
